package dao;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil{
    private static final String URL="jdbc:mysql://127.0.0.1:3306/java100_blog?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME="root";
    private static final String PASSWORD="123456wjh.";
    private static volatile DataSource dataSource=getDataSource();
    private static DataSource getDataSource(){
        if (dataSource==null){
            synchronized (DBUtil.class){
                if (dataSource==null) {
                    dataSource=new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }
    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet) throws SQLException {
        if (connection!=null){
            connection.close();
        }if (statement!=null){
            statement.close();
        }if (resultSet!=null){
            resultSet.close();
        }
    }
}
